/*
 * Copyright (c) 2015. Ncomz. All Rights Reserved
 */

package com.google.zxing.client.android;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import com.ntels.kneet.v3.R;

import java.io.ByteArrayOutputStream;
import java.util.Map;

final class DecodeHandler extends Handler {

	private static final String TAG = DecodeHandler.class.getSimpleName();

	private final Reader_Qr         activity;
	private final MultiFormatReader multiFormatReader;
	private boolean running = true;

	DecodeHandler(Reader_Qr activity, Map<DecodeHintType, Object> hints) {

		multiFormatReader = new MultiFormatReader();
		multiFormatReader.setHints(hints);
		this.activity = activity;
	}

	@Override public void handleMessage(Message message) {

		if ( !running ) {
			return;
		}
		switch (message.what) {
			case R.id.decode:
				decode((byte[]) message.obj, message.arg1, message.arg2);
				break;
			case R.id.quit:
				running = false;
				Looper.myLooper().quit();
				break;
		}
	}

	/**
	 * Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
	 * reuse the same reader objects from one decode to the next.
	 *
	 * @param data
	 *            The YUV preview frame.
	 * @param width
	 *            The width of the preview frame.
	 * @param height
	 *            The height of the preview frame.
	 */
	private void decode(byte[] data, int width, int height) {

		long start = System.currentTimeMillis();
		Result rawResult = null;

		byte[] rotatedData = new byte[data.length];
		for ( int y = 0; y < height; y++ ) {
			for ( int x = 0; x < width; x++ )
				rotatedData[x * height + height - y - 1] = data[x + y * width];
		}
		int tmp = width;
		width = height;
		height = tmp;
		data = rotatedData;

		PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(data, width, height);
		if (source != null) {
			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
			try {
				rawResult = multiFormatReader.decodeWithState(bitmap);
			} catch (ReaderException re) {
				// continue
			} finally {
				multiFormatReader.reset();
			}
		}

		Handler handler = activity.getHandler();
		if (rawResult != null) {
			// Don't log the barcode contents for security.
			long end = System.currentTimeMillis();
			Log.d(TAG, "Found barcode in " + (end - start) + " ms");
			if (handler != null) {
				Message message = Message.obtain(handler, R.id.decode_succeeded, rawResult);
				Bundle bundle = new Bundle();
				bundleThumbnail(source, bundle);
				message.setData(bundle);
				message.sendToTarget();
			}
		} else {
			if (handler != null) {
				Message message = Message.obtain(handler, R.id.decode_failed);
				message.sendToTarget();
			}
		}
	}

	private static void bundleThumbnail(PlanarYUVLuminanceSource source, Bundle bundle) {
		int[] pixels = source.renderThumbnail();
		int width = source.getThumbnailWidth();
		int height = source.getThumbnailHeight();
		Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.ARGB_8888);
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out);
		bundle.putByteArray(DecodeThread.BARCODE_BITMAP, out.toByteArray());
		bundle.putFloat(DecodeThread.BARCODE_SCALED_FACTOR, (float) width / source.getWidth());
	}

}
